Improvement in patterns for laying out furrows in millstones



G. T. SMITH.

PATTERNS FOR LAYING OUT FURROWS IN MILLSTONES. No. 179,230. PatentedJune 27.1876.

N-PETERS. PNOTO-UTKOGRAPNER. WASHINGTON. D. c.

UNITED 'r TES GEORGE T. SMITH, OF

ST. LOUIS, MISSOURI.

Specification forming part of Letters Patent No. 179,2 30,

dated June 27, 1876; application filed June 9, 1876.

To all whom it may concern:

Be it known that I, GEORGE T. SMITH, of St. Louis, in the county of St.Louis and State of Missouri, have invented certain new and usefulImprovements in Pattern for Laying Out Furrows in Millstones; and I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part-of this specification.

The nature of this invention relates to the peculiar construction andoperation of a pattern by means of which furrows may be accurately andexpeditiously laid ofl' upon millstones, and consists of a slotted plateof wood, or other suitable material, which is adjusted to and guided bythe outer edge of the burrs.

Figurel is a top or plan view of my pattern. Fig. 2 is an edge view.

In the accompanying drawings, A repre sents the plate-piece of thepattern. B represents a detachable guide-piece attached to the plate Aby screws a a a a. O 0 represent pins or projections, which, if desired,may be used in lieu of the piece B to guide the plate. A A representslots cut through the plate A for the purpose of exhibiting the placesto be marked on the stones for furrows. Each of these slots runs in adirection tangential to a circle concentric with the rim of themillstone, and may be of any required length and breadth. The plate Amay be of any desirable size and shape. The guide-piece B, or theguide-pins O 0, may be attached to either or both sides of the plate A,so that furrows running either to the right hand or the left may be laidoff upon the stones with the same pattern.

The accompanying drawings are one-half the size of a working model, andby reference to them it will be seen that the slots A A are thereinarbitrarily adjusted to the plate A for a draft of about nine andone-half inches on a four and one-half foot-stone. An adjustment to anyother draft, however, can be obtained by slotting the plate indirections tangential to the circle of the draft desired, or by movingone or both ends of the guide. By this instrument, properly arranged,the operation of laying off furrows upon millstones is greatlysimplified. The plate is placed upon the stone, and the guide adjustedto the rim, as above described, when a furrow or set of furrows can beaccurately marked through the slots. The plate is then moved around uponthe rim till the slots indicate the position of the next furrow, or setof furrows. Under some circumstances the piece B and pins 0 0 may bedispensed with, and the outer extremities of the slots A A be made toconform to the circumference of the stone, thus furnishing a gage forthe position of the plate when in operation.

Having thus described the construction and operation of my invention,what I claim is 1. The plate A, provided with slots A A, substantiallyas set forth.

2. In combination with A, the guide-piece B, or the tially as set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

the slotted plate pins 0 O, substan- GEORGE T. SMITH.

Witnesses:

H. H. DOUBLEDAY, W. H. CARTER.

